lib/netdev-windows.c

   1 /*
   2  * Copyright (c) 2014 VMware, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <stdlib.h>
  18 #include <config.h>
  19 #include <errno.h>
  20 #include <iphlpapi.h>
  21
  22 #include <net/if.h>
  23
  24 #include "coverage.h"
  25 #include "fatal-signal.h"
  26 #include "netdev-provider.h"
  27 #include "ofpbuf.h"
  28 #include "packets.h"
  29 #include "poll-loop.h"
  30 #include "shash.h"
  31 #include "svec.h"
  32 #include "openvswitch/vlog.h"
  33 #include "odp-netlink.h"
  34 #include "netlink-socket.h"
  35 #include "netlink.h"
  36
  37 VLOG_DEFINE_THIS_MODULE(netdev_windows);
  38 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
  39
  40 enum {
  41     VALID_ETHERADDR         = 1 << 0,
  42     VALID_MTU               = 1 << 1,
  43     VALID_IFFLAG            = 1 << 5,
  44 };
  45
  46 /* Caches the information of a netdev. */
  47 struct netdev_windows {
  48     struct netdev up;
  49     int32_t dev_type;
  50     uint32_t port_no;
  51
  52     unsigned int change_seq;
  53
  54     unsigned int cache_valid;
  55     int ifindex;
  56     struct eth_addr mac;
  57     uint32_t mtu;
  58     unsigned int ifi_flags;
  59 };
  60
  61 /* Utility structure for netdev commands. */
  62 struct netdev_windows_netdev_info {
  63     /* Generic Netlink header. */
  64     uint8_t cmd;
  65
  66     /* Information that is relevant to ovs. */
  67     uint32_t dp_ifindex;
  68     uint32_t port_no;
  69     uint32_t ovs_type;
  70
  71     /* General information of a network device. */
  72     const char *name;
  73     struct eth_addr mac_address;
  74     uint32_t mtu;
  75     uint32_t ifi_flags;
  76 };
  77
  78 static int query_netdev(const char *devname,
  79                         struct netdev_windows_netdev_info *reply,
  80                         struct ofpbuf **bufp);
  81 static struct netdev *netdev_windows_alloc(void);
  82 static int netdev_windows_init_(void);
  83
  84 /* Generic Netlink family numbers for OVS.
  85  *
  86  * Initialized by netdev_windows_init_(). */
  87 static int ovs_win_netdev_family;
  88 struct nl_sock *ovs_win_netdev_sock;
  89
  90
  91 static bool
  92 is_netdev_windows_class(const struct netdev_class *netdev_class)
  93 {
  94     return netdev_class->alloc == netdev_windows_alloc;
  95 }
  96
  97 static struct netdev_windows *
  98 netdev_windows_cast(const struct netdev *netdev_)
  99 {
 100     ovs_assert(is_netdev_windows_class(netdev_get_class(netdev_)));
 101     return CONTAINER_OF(netdev_, struct netdev_windows, up);
 102 }
 103
 104 static int
 105 netdev_windows_init_(void)
 106 {
 107     int error = 0;
 108     static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
 109
 110     if (ovsthread_once_start(&once)) {
 111         error = nl_lookup_genl_family(OVS_WIN_NETDEV_FAMILY,
 112                                       &ovs_win_netdev_family);
 113         if (error) {
 114             VLOG_ERR("Generic Netlink family '%s' does not exist. "
 115                      "The Open vSwitch kernel module is probably not loaded.",
 116                      OVS_WIN_NETDEV_FAMILY);
 117         }
 118         if (!error) {
 119             /* XXX: Where to close this socket? */
 120             error = nl_sock_create(NETLINK_GENERIC, &ovs_win_netdev_sock);
 121         }
 122
 123         ovsthread_once_done(&once);
 124     }
 125
 126     return error;
 127 }
 128
 129 static struct netdev *
 130 netdev_windows_alloc(void)
 131 {
 132     struct netdev_windows *netdev = xzalloc(sizeof *netdev);
 133     return netdev ? &netdev->up : NULL;
 134 }
 135
 136 static uint32_t
 137 dp_to_netdev_ifi_flags(uint32_t dp_flags)
 138 {
 139     uint32_t nd_flags = 0;
 140
 141     if (dp_flags && OVS_WIN_NETDEV_IFF_UP) {
 142         nd_flags |= NETDEV_UP;
 143     }
 144
 145     if (dp_flags && OVS_WIN_NETDEV_IFF_PROMISC) {
 146         nd_flags |= NETDEV_PROMISC;
 147     }
 148
 149     return nd_flags;
 150 }
 151
 152 static int
 153 netdev_windows_system_construct(struct netdev *netdev_)
 154 {
 155     struct netdev_windows *netdev = netdev_windows_cast(netdev_);
 156     struct netdev_windows_netdev_info info;
 157     struct ofpbuf *buf;
 158     int ret;
 159
 160     /* Query the attributes and runtime status of the netdev. */
 161     ret = query_netdev(netdev_get_name(&netdev->up), &info, &buf);
 162     if (ret) {
 163         return ret;
 164     }
 165     ofpbuf_delete(buf);
 166
 167     netdev->change_seq = 1;
 168     netdev->dev_type = info.ovs_type;
 169     netdev->port_no = info.port_no;
 170
 171     netdev->mac = info.mac_address;
 172     netdev->cache_valid = VALID_ETHERADDR;
 173     netdev->ifindex = -EOPNOTSUPP;
 174
 175     netdev->mtu = info.mtu;
 176     netdev->cache_valid |= VALID_MTU;
 177
 178     netdev->ifi_flags = dp_to_netdev_ifi_flags(info.ifi_flags);
 179     netdev->cache_valid |= VALID_IFFLAG;
 180
 181     VLOG_DBG("construct device %s, ovs_type: %u.",
 182              netdev_get_name(&netdev->up), info.ovs_type);
 183     return 0;
 184 }
 185
 186 static int
 187 netdev_windows_netdev_to_ofpbuf(struct netdev_windows_netdev_info *info,
 188                                 struct ofpbuf *buf)
 189 {
 190     struct ovs_header *ovs_header;
 191     int error = EINVAL;
 192
 193     nl_msg_put_genlmsghdr(buf, 0, ovs_win_netdev_family,
 194                           NLM_F_REQUEST | NLM_F_ECHO,
 195                           info->cmd, OVS_WIN_NETDEV_VERSION);
 196
 197     ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
 198     ovs_header->dp_ifindex = info->dp_ifindex;
 199
 200     if (info->name) {
 201         nl_msg_put_string(buf, OVS_WIN_NETDEV_ATTR_NAME, info->name);
 202         error = 0;
 203     }
 204
 205     return error;
 206 }
 207
 208 static void
 209 netdev_windows_info_init(struct netdev_windows_netdev_info *info)
 210 {
 211     memset(info, 0, sizeof *info);
 212 }
 213
 214 static int
 215 netdev_windows_netdev_from_ofpbuf(struct netdev_windows_netdev_info *info,
 216                                   struct ofpbuf *buf)
 217 {
 218     static const struct nl_policy ovs_netdev_policy[] = {
 219         [OVS_WIN_NETDEV_ATTR_PORT_NO] = { .type = NL_A_U32 },
 220         [OVS_WIN_NETDEV_ATTR_TYPE] = { .type = NL_A_U32 },
 221         [OVS_WIN_NETDEV_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
 222         [OVS_WIN_NETDEV_ATTR_MAC_ADDR] = { NL_POLICY_FOR(info->mac_address) },
 223         [OVS_WIN_NETDEV_ATTR_MTU] = { .type = NL_A_U32 },
 224         [OVS_WIN_NETDEV_ATTR_IF_FLAGS] = { .type = NL_A_U32 },
 225     };
 226
 227     struct nlattr *a[ARRAY_SIZE(ovs_netdev_policy)];
 228     struct ovs_header *ovs_header;
 229     struct nlmsghdr *nlmsg;
 230     struct genlmsghdr *genl;
 231     struct ofpbuf b;
 232
 233     netdev_windows_info_init(info);
 234
 235     ofpbuf_use_const(&b, buf->data, buf->size);
 236     nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
 237     genl = ofpbuf_try_pull(&b, sizeof *genl);
 238     ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
 239     if (!nlmsg || !genl || !ovs_header
 240         || nlmsg->nlmsg_type != ovs_win_netdev_family
 241         || !nl_policy_parse(&b, 0, ovs_netdev_policy, a,
 242                             ARRAY_SIZE(ovs_netdev_policy))) {
 243         return EINVAL;
 244     }
 245
 246     info->cmd = genl->cmd;
 247     info->dp_ifindex = ovs_header->dp_ifindex;
 248     info->port_no = nl_attr_get_odp_port(a[OVS_WIN_NETDEV_ATTR_PORT_NO]);
 249     info->ovs_type = nl_attr_get_u32(a[OVS_WIN_NETDEV_ATTR_TYPE]);
 250     info->name = nl_attr_get_string(a[OVS_WIN_NETDEV_ATTR_NAME]);
 251     memcpy(info->mac_address, nl_attr_get_unspec(a[OVS_WIN_NETDEV_ATTR_MAC_ADDR],
 252                sizeof(info->mac_address)), sizeof(info->mac_address));
 253     info->mtu = nl_attr_get_u32(a[OVS_WIN_NETDEV_ATTR_MTU]);
 254     info->ifi_flags = nl_attr_get_u32(a[OVS_WIN_NETDEV_ATTR_IF_FLAGS]);
 255
 256     return 0;
 257 }
 258
 259 static int
 260 query_netdev(const char *devname,
 261              struct netdev_windows_netdev_info *info,
 262              struct ofpbuf **bufp)
 263 {
 264     int error = 0;
 265     struct ofpbuf *request_buf;
 266
 267     ovs_assert(info != NULL);
 268     netdev_windows_info_init(info);
 269
 270     error = netdev_windows_init_();
 271     if (error) {
 272         if (info) {
 273             *bufp = NULL;
 274             netdev_windows_info_init(info);
 275         }
 276         return error;
 277     }
 278
 279     request_buf = ofpbuf_new(1024);
 280     info->cmd = OVS_WIN_NETDEV_CMD_GET;
 281     info->name = devname;
 282     error = netdev_windows_netdev_to_ofpbuf(info, request_buf);
 283     if (error) {
 284         ofpbuf_delete(request_buf);
 285         return error;
 286     }
 287
 288     error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
 289     ofpbuf_delete(request_buf);
 290
 291     if (info) {
 292         if (!error) {
 293             error = netdev_windows_netdev_from_ofpbuf(info, *bufp);
 294         }
 295         if (error) {
 296             netdev_windows_info_init(info);
 297             ofpbuf_delete(*bufp);
 298             *bufp = NULL;
 299         }
 300     }
 301
 302     return 0;
 303 }
 304
 305 static void
 306 netdev_windows_destruct(struct netdev *netdev_)
 307 {
 308
 309 }
 310
 311 static void
 312 netdev_windows_dealloc(struct netdev *netdev_)
 313 {
 314     struct netdev_windows *netdev = netdev_windows_cast(netdev_);
 315     free(netdev);
 316 }
 317
 318 static int
 319 netdev_windows_get_etheraddr(const struct netdev *netdev_,
 320                              struct eth_addr *mac)
 321 {
 322     struct netdev_windows *netdev = netdev_windows_cast(netdev_);
 323
 324     ovs_assert((netdev->cache_valid & VALID_ETHERADDR) != 0);
 325     if (netdev->cache_valid & VALID_ETHERADDR) {
 326         *mac = netdev->mac;
 327     } else {
 328         return EINVAL;
 329     }
 330     return 0;
 331 }
 332
 333 static int
 334 netdev_windows_get_mtu(const struct netdev *netdev_, int *mtup)
 335 {
 336     struct netdev_windows *netdev = netdev_windows_cast(netdev_);
 337
 338     ovs_assert((netdev->cache_valid & VALID_MTU) != 0);
 339     if (netdev->cache_valid & VALID_MTU) {
 340         *mtup = netdev->mtu;
 341     } else {
 342         return EINVAL;
 343     }
 344     return 0;
 345 }
 346
 347 /* This functionality is not really required by the datapath.
 348  * But vswitchd bringup expects this to be implemented. */
 349 static int
 350 netdev_windows_set_etheraddr(const struct netdev *netdev_,
 351                              const struct eth_addr mac)
 352 {
 353     return 0;
 354 }
 355
 356 /* This functionality is not really required by the datapath.
 357  * But vswitchd bringup expects this to be implemented. */
 358 static int
 359 netdev_windows_update_flags(struct netdev *netdev_,
 360                             enum netdev_flags off,
 361                             enum netdev_flags on,
 362                             enum netdev_flags *old_flagsp)
 363 {
 364     struct netdev_windows *netdev = netdev_windows_cast(netdev_);
 365
 366     ovs_assert((netdev->cache_valid & VALID_IFFLAG) != 0);
 367     if (netdev->cache_valid & VALID_IFFLAG) {
 368         *old_flagsp = netdev->ifi_flags;
 369         /* Setting the interface flags is not supported. */
 370     } else {
 371         return EINVAL;
 372     }
 373     return 0;
 374 }
 375
 376 /* Looks up in the ARP table entry for a given 'ip'. If it is found, the
 377  * corresponding MAC address will be copied in 'mac' and return 0. If no
 378  * matching entry is found or an error occurs it will log it and return ENXIO.
 379  */
 380 static int
 381 netdev_windows_arp_lookup(const struct netdev *netdev,
 382                           ovs_be32 ip, struct eth_addr *mac)
 383 {
 384     PMIB_IPNETTABLE arp_table = NULL;
 385     /* The buffer length of all ARP entries */
 386     uint32_t buffer_length = 0;
 387     uint32_t ret_val = 0;
 388     uint32_t counter = 0;
 389
 390     ret_val = GetIpNetTable(arp_table, &buffer_length, false);
 391
 392     if (ret_val != ERROR_INSUFFICIENT_BUFFER ) {
 393         VLOG_ERR("Call to GetIpNetTable failed with error: %s",
 394                  ovs_format_message(ret_val));
 395         return ENXIO;
 396     }
 397
 398     arp_table = (MIB_IPNETTABLE *) malloc(buffer_length);
 399
 400     if (arp_table == NULL) {
 401         VLOG_ERR("Could not allocate memory for all the interfaces");
 402         return ENXIO;
 403     }
 404
 405     ret_val = GetIpNetTable(arp_table, &buffer_length, false);
 406
 407     if (ret_val == NO_ERROR) {
 408         for (counter = 0; counter < arp_table->dwNumEntries; counter++) {
 409             if (arp_table->table[counter].dwAddr == ip) {
 410                 memcpy(mac, arp_table->table[counter].bPhysAddr, ETH_ADDR_LEN);
 411
 412                 free(arp_table);
 413                 return 0;
 414             }
 415         }
 416     } else {
 417         VLOG_ERR("Call to GetIpNetTable failed with error: %s",
 418                  ovs_format_message(ret_val));
 419     }
 420
 421     free(arp_table);
 422     return ENXIO;
 423 }
 424
 425 static int
 426 netdev_windows_get_next_hop(const struct in_addr *host,
 427                             struct in_addr *next_hop,
 428                             char **netdev_name)
 429 {
 430     uint32_t ret_val = 0;
 431     /* The buffer length of all addresses */
 432     uint32_t buffer_length = 1000;
 433     PIP_ADAPTER_ADDRESSES all_addr = NULL;
 434     PIP_ADAPTER_ADDRESSES cur_addr = NULL;
 435
 436     ret_val = GetAdaptersAddresses(AF_INET,
 437                                    GAA_FLAG_INCLUDE_PREFIX |
 438                                    GAA_FLAG_INCLUDE_GATEWAYS,
 439                                    NULL, all_addr, &buffer_length);
 440
 441     if (ret_val != ERROR_INSUFFICIENT_BUFFER ) {
 442         VLOG_ERR("Call to GetAdaptersAddresses failed with error: %s",
 443                  ovs_format_message(ret_val));
 444         return ENXIO;
 445     }
 446
 447     all_addr = (IP_ADAPTER_ADDRESSES *) malloc(buffer_length);
 448
 449     if (all_addr == NULL) {
 450         VLOG_ERR("Could not allocate memory for all the interfaces");
 451         return ENXIO;
 452     }
 453
 454     ret_val = GetAdaptersAddresses(AF_INET,
 455                                    GAA_FLAG_INCLUDE_PREFIX |
 456                                    GAA_FLAG_INCLUDE_GATEWAYS,
 457                                    NULL, all_addr, &buffer_length);
 458
 459     if (ret_val == NO_ERROR) {
 460         cur_addr = all_addr;
 461         while (cur_addr) {
 462             if(cur_addr->FirstGatewayAddress &&
 463                cur_addr->FirstGatewayAddress->Address.lpSockaddr) {
 464                 struct sockaddr_in *ipv4 = (struct sockaddr_in *)
 465                                            cur_addr->FirstGatewayAddress->Address.lpSockaddr;
 466                 next_hop->s_addr = ipv4->sin_addr.S_un.S_addr;
 467                 *netdev_name = xstrdup((char *)cur_addr->FriendlyName);
 468
 469                 free(all_addr);
 470
 471                 return 0;
 472             }
 473
 474             cur_addr = cur_addr->Next;
 475         }
 476     } else {
 477         VLOG_ERR("Call to GetAdaptersAddresses failed with error: %s",
 478                  ovs_format_message(ret_val));
 479     }
 480
 481     if (all_addr) {
 482         free(all_addr);
 483     }
 484     return ENXIO;
 485 }
 486
 487 static int
 488 netdev_windows_internal_construct(struct netdev *netdev_)
 489 {
 490     return netdev_windows_system_construct(netdev_);
 491 }
 492
 493
 494 #define NETDEV_WINDOWS_CLASS(NAME, CONSTRUCT)                           \
 495 {                                                                       \
 496     .type               = NAME,                                         \
 497     .alloc              = netdev_windows_alloc,                         \
 498     .construct          = CONSTRUCT,                                    \
 499     .destruct           = netdev_windows_destruct,                      \
 500     .dealloc            = netdev_windows_dealloc,                       \
 501     .get_etheraddr      = netdev_windows_get_etheraddr,                 \
 502     .set_etheraddr      = netdev_windows_set_etheraddr,                 \
 503     .update_flags       = netdev_windows_update_flags,                  \
 504     .get_next_hop       = netdev_windows_get_next_hop,                  \
 505     .arp_lookup         = netdev_windows_arp_lookup,                    \
 506 }
 507
 508 const struct netdev_class netdev_windows_class =
 509     NETDEV_WINDOWS_CLASS(
 510         "system",
 511         netdev_windows_system_construct);
 512
 513 const struct netdev_class netdev_internal_class =
 514     NETDEV_WINDOWS_CLASS(
 515         "internal",
 516         netdev_windows_internal_construct);